Attachment-plug.



VJ; S. GROSSLBY.

ATTACHMENT PLUG.

APPLIoATloN FILED Nov. 3o, ma.

Patented July 4,' 1911.

INI/Enron ms 'mssl WIYTNESSES:

- To azz-whamimymm:

'- citizen ofthe' United States, residingat 'Sol'- vay, in`the county ofNew York,` have on s oLvAy, NEW YORK; Af"

Be it known that I, JAMns S.- CRos'SLEY, a

.of Onondaga and State invented new and useful Improvements invAttac'hn'ient?Plugs y of which the 'following is a specifica-tion. jThis invention relates to contact plugs to tion `of 'plug socket,a'second lis used. in electric installations and for electric wiring,and consists ina new construe# composed of a part -tted tothepartcarrying the wire terminals, Vand of spring locking means wherei vwoparts may be connected vtogether or 'disco1n ected, easily and.conveniently without'ftols -or manipulations of special ence numerals'are used vto indicate the corresponding parts.

partsand'without arranging' the one part in any particular relationtothe other. i

, My invention is -fully illustrated in the rawing herewith vin .whichthe same reier- 'to'engage and make contact with the contact ring'6`'when-the parts are,`assembled. This-- clamp is'preferably formed withtwo parts in this description Figurel 1 is an elevation1 of the plugcom- Fig. 4l is a plan :o

Vend', of the plug element. Fig. 5 isa plan said annu are verticalsections ht angles to each other. the bottom or engaging Figs. "2 and 3substantially sat; 'ri

of the top, or engaging end-'of the cap:A

I Y In the figures lindicates the base, or'plugelement, made ofa'nyfsuitablel insulating material, preferably porcelaimand provided" onits lower,-or contact, end with lthe rim ior i margin 2 andthe recessedpost'j3, which formthe g roove, or annularichamber, 4. I In groove 1sarranged the contact rlng, or ar contact, 6 secured 1n place andelectrically connected 'by the screw or screws 7' tothe usualthreadedouter plug terminal 8,1

":arranged on the"shank 9 bf the base. -In

the recess 11 `formed il the post 3, islar- #ranged a spring contactvofany suitable shape,

ably but firmly ber and through is effected 4between vthe central bylmeans of which the cup `is. detach-"i which electrical connection ,or'innerf" scket terminal and lone of ythe conductors. As he're;shownthisjspring contact "consists fof .a single piece l14' havmg 'two"or more somewhatl resilient ends 1 5 providedwith the flaring ti s 16,and -formedi with the openingsfor epressions 17 arranged ljsubstantia lyas shown.`- T 'held in place'by the screw 18, whose head 19 forms thecentral plug" contact. Thisscrew head maybe separated andfns'ulatedrangement of the plug vare firm disconnected easlly connected to the,-plug memyond the `nduof the his spring contact is?v with Haring 0FYORK. 4,

Patented any 4, 1911,

usual binding screws are'secured to theV cap respectively bythe securingscrews26 and 27, orby other suitable means. Termithe easy introduci-V I'vfrom the threadedjcontactlhy' thetip20 on terminals.. having Vthe i na'l v24 has the stiff metallic shank 28fproif vided with the -head' 2 9,which -zengages `firmly with the springcontact on the base when the capisset. in position andpressed home', and the conductors are -thus firmlybut detachably secured `to the base. otheror outerwire terminal 25 hasaclaw or clamp 30`securedin place n by. screw 26 as showmto engagewiththe ring on both` sides; one ofsaid parts, for instance 31,'may

be made of sprmg "metal, for better elecr trical conneetion'.'I

In making my device 'the plug element may first be Y cap connectedthereto, merely 'by being l.pressed home'and without any special 'ar'-varts -with reference vto eachother.. It is o course understood that theconductors are rst connected to the cap bymean's of the binding screws.Or, if deand the: latter then screwed homeintb i sired, the cap and basemay irst be connect'- ed the socket, which may be doneV withoutV screwedinto the socket andthe v Thevbreaking the connection Vor twisting" thewires. In all y .connected and yet may be either or va pull at an angle.

*Having thus described my inventiom/what l los 1positiens the twopartsofthe by a straight pull E 1n's`aid"groove, a s ringtcontact in said' re-kcess having oppose s ring lingers providedtips;` an fnotchesfiminedlatel within ``tips, a single outer 'Wire terminalon'theuprier surface of op osed spring fingers to engage the inner wireterminal on the cap, 'and' a verticallyl .extending 'shank on. saidcentral terminal y having ai head adapted to engage with' the notched:fingers to secure'the cap-tothe base, substantially as described andshown.)

outersurfaces of the-ruig, a lcentral 2. In an electricalattachment-plug, the combination with the cap andl'the base ofinsulating material, a contact ring on the base, a terminal n the cap toengage said ring ,when the parts are assembled, said ter- I minalhavngbpposed spring fingers to engage the inner'and outer peripheralsurfaces of said ring, a spring contact om the base having opposed capoppositely name to-this specification in the presence of two subscribingWitnesses.A A l [JAMES S. CROSSLEY. i Witnesses: Y

B. E. SALISBURY, R. PQCOVNTRYY'

